The synthesis of Multi-Walled Carbon Nanotubes (MWCNTs) by Chemical Vapor Deposition (CVD) is becoming most ideal method for producing large quantity of CNT at different temperature conditions. Nano-porous materials such as transition metal carbonates with bimetallic alloy catalyst were used to fabricate MWCNTs with high yield and less amorphous carbon. In the present research work, the MWCNTs were successfully fabricated using Fe-Ni bimetallic catalyst on CaCO₃ support with the 180% optimum yield. The proposed yield was high and less-cost effective catalysts to other methods. The yield of MWCNTs depends on four parameters such as growth time (30/45 min), growth temperature (700/730 ^oC), acetylene flow rate (150/190 ml/min) and argon flow rate (800/900 ml/min). The impact of the reaction temperature and the flow rates were observed to be most significant on the high yield of MWCNTs.

中文翻译：

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Fe-Ni纳米粒子在CaCO3上催化多壁碳纳米管的控制合成

通过化学气相沉积（CVD）合成多壁碳纳米管（MWCNT）成为在不同温度条件下生产大量CNT的最理想方法。使用具有双金属合金催化剂的纳米多孔材料（例如过渡金属碳酸盐）来制备高收率和较少的无定形碳的MWCNT。在本研究工作中，使用Fe-Ni双金属催化剂在CaCO ₃载体上成功制备了MWCNT，最佳收率为180％。与其他方法相比，建议的收率高且成本更低的有效催化剂。MWCNT的产量取决于四个参数，例如生长时间（30/45分钟），生长温度（700/730 ^oC），乙炔流量（150/190 ml / min）和氩气流量（800/900 ml / min）。观察到反应温度和流速的影响对MWCNT的高产率最显着。